Transmitter, Integrated Key Fob: Operation

The FOB with Integrated Key (FOBIK) incorporates many useful functions into a single, compact unit. The transducer on the internal circuit board of the FOBIK uses low frequency Radio Frequency (RF) communication to ensure vehicle security through an electronic validation or handshake process that is performed with the Radio Frequency Hub (RF-Hub) each time the engine is started.

When any one of the Remote Keyless Entry (RKE) buttons of the FOBIK is depressed, the on-board transmitter of the FOBIK generates a high frequency RF request signal that is received and validated by the RF-Hub. If the RF-Hub determines that the RF signal was generated by a FOBIK that is valid for the vehicle, the RF-Hub relays electronic request messages to the appropriate electronic modules in the vehicle over the Controller Area Network-Chassis (CAN-C) bus to invoke the functions or features associated with the request.

Diagnosis of a FOBIK transmitter requires the use of a Radio Frequency Detector.

(Special Tool #9001, RF Detector)